Carbureter



'1. ROBINSON.

CARBURETER.

APPLICATION FILED IAN. 28,1919- RENEWED JAN. 8.1921.

Patented Aug. 9, 1921.

2 $HEETS-SHEET 1- WITNESS Y C N A L C E O J ATTORNEY J. T. ROBINSON.

CARBURETER.

APPLICATION FILED JAN- 28, l9l9- RENEWED JAN. 8. 19-21- 1 387,01 3 i Patented Aug. 9, 1921.

ZSHEETS-SHEET 2- INVENTOR JEssE T Eosmsow Wnrmezss Jos.\A/. QLANQY Arronmsr JESSE T. ROBINSON, 0F BIRMINGHAMI, ALABAM'A.

CAR-BURETER.

Application filed January 28, 1919, Serial No. 273,666.

To all to 710m it may comm m Be it known that 1, Jesse T. RonINsoN, a citizen of the United States of America, residing at Birmingham, in the county of Jeflerson and State of Alabama, have invented certain new and useful Improvements in Carburetors, of which the following is a specification.

My invention relates to carbureters for internal combustion engines, and its object is to provide means for maintaining the oil at the desired level in the carburetor without requiring a float and valve.

My invention contemplates the combination of an oil supply chamber to which the oil may be supplied by any practical oil feeding system, and this chamber is provided with a conduit for conducting the oil by gravity .flow to the carbureter and with an air vent pipe which is adapted to be closed or sealed responsive to the rise of the oil in the carbureter above a predetermined level, and when the vent pipe is thus sealed the outflow of oil from the overhead tank, which is otherwise pressure tight, is immediately interrupted. Obviously the simplest and most eiiect-ive means for sealing the vent is by conducting a vent tube into the car bureter so that it will be sealed by the rising level of the oil therein.

Where the fluid in the carbureter seals the open end of the vent pipe the latter should open at the center of the carbureter so that the oil level at this point will not vary by reason of the carbureter being tilted from level position.

In the accompanying drawings I have illustrated. several embodiments of my invention as applied to the various types of gasolene feed systems now in general use on automobiles, but it is to be understood that my invention is not dependent upon any particular type of feed system.

According to the drawings Figure 1 illustrates my invention in connection with a vacuum feed system with the carbureter and its supply tank shown partially in section.

Fig. 2 illustrates the necessary modifications to adapt a pressure feed system for use with my invention.

Fig. 8 illustrates the modifications necessary to adapt a gravity feed system for use with my invention.

Fig. 4; is an enlarged detail view in section Specification of Letters Patent.

Renewed January 8, 1921. Serial No. 435,980.

of the adjustable fitting on the end of the air vent pipe entering the carbureter.

Similar reference numerals refer to similar parts throughout the drawings.

As illustrated in Fig. 1, 1 is any standard type of carbureter having an oil chamber 2 communicating with the spray nozzle 3 in an air passage 4 leading to the manifold 5. The gasolene or oil used is supplied to the carbureter as illustrated by gravity by a plpe 6 entering the bottom of the carbureter through a fitting 7 having a drain cock 8. A cap 9 is screwed on top of the carbureter and provided with an air vent opening 10 and a threaded central opening in a boss 11, which opening receives a threaded adjusting sleeve 12 that is held in desired adjustment in the carbureter by a lock nut 13 and is provided with a head 'l l internally recessed and threaded to receive a screw gasket plug 15 having a central opening to receive a vent pipe 16 formed by copper tubing or any other suitable material and having its end spread at 17 and normally clamped between the plug 15 and the annular seat 18 in the head 14:. This arrangement is merely typical of any standard connection which can be made air tight between the tubing 16 and the sleeve 12, and which can be readily loosened to permit the adjustment oi the sleeve in the carburetor. The pipe 16 forms the air vent pipe for the oil supply chamber 19 in the feed tank 20 which is mounted above the carbureter on the dash 21. The tank 20 illustrated is of any standard vacuum feed system wherein a suction pipe 22 leads from the manifold 5 into the feed chamber 23 in the tank, where a float 24 controls the suction and air venting valves in the manner well understood in the art and which forms no part of my present invention. When the suction valve is opened and the venting valve for chamber 23 is closed, oil is drawn into the chamber through a supply pipe 25 and when the suction valve is closed and the vent valve is opened responsive to the action of the float, the oil will flow through the outlet 26 past a check valve 27 into the chamber 19. A check valve 84; adapted to open responsive to the suction in the manifold is disposed in the pipe 22 and will act to prevent access or atmospheric pressure to the tank 23 from the manifold. It will be understood that this tank construction forms no part of my present invention and is merely illustrated as one suitable means for the supply of motor fluid to the carbureter in accordance with my invention.

In Fig. 2 the supply tank 20 is adapted for use with any standard air pressure feed system in which the oil is forced by air pressure in the supply tank through pipe 25 past a float control valve 28 into the supply chamber 19 from which the oil flows through pipe 6 to the carbureter. The air vent pipe 16 enters the top or" the tank 20 which is otherwise sealed.

In Fig. 3 I illustrate a gravity feed supply tank in the cowl adapted for use with my invention. Here the supply tank 20 is provided with a filling tube having an air tight cap 30 and the vent pipe 16 is connected with the top of the tank and the feed pipe 6 for the carbureter leads from the bottom of the tank through a valve fitting 31 having a valve 32 controlled by a handle 33 which has a universal connection therewith and projects through the dash 21.

In operation, the adjusting sleeve 12 is screwed through the carbureter cap until its open end stands at the level at which it is desired to maintain the oil or gasolene there in, which is near the level of the tip of the spray nozzle 8. The clamp nut 13 is then tightened and the plug 15 is screwed up to insure an air tight coupling between the tubing 16 and the sleeve 12. As the oil is fed from the chamber 19, 19 or 20 through pipe 6 to the carbureter it rises therein until it closes the open end of the sleeve 12 which is equivalent to closing or sealing the vent pipe, whereupon the chamber 19, 19 or 20 becomes sealed and the outflow of oil therefrom is interrupted until the feed is resumed when its flow continues until the vent is again sealed. I thus obtain a practically continuous automatic feed, which is self regulating and can not flood the carbureter without requiring movable parts to acc0m plish that end. The chamber 19 or 19 is sealed against the admission of air otherwise than through the vent pipe 16. In the gravity feed system the tank 20 is likewise sealed against admission of air except when its filling tube is opened by removing the cap 30, when it is necessary to close valve 32, as otherwise the tank would drain itself through the carbureter. When the filling operation is completed and the air tight plug 30 screwed home, the valve 32 is again opened and the feed of oil proceeds under control of the sealing and unsealing of the vent pipe 16.

It is preferable that the adjustable end of the air vent pipe in the carbureter should pass through the vertical axis thereof so as to be unaffected by an inclination of the carbureter or by the wash of oil therein responsive to irregular movements, jolts or vibrations of the car. I thus obtain a control or" the carbureter feed which is practically unaiiected by the vibration or jolting of the car and which is much more reliable than any float feed which is necessarily responsive to jolts or vibrations.

This invention is not intended to be restricted in scope to the specific embodiments shown, but contemplates such modifications as come within the spirit and scope of the claims.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent, is

1. In combination, a carbureter, an oil supply tank disposed above the carbureter and having an oil feed pipe connected to the carbureter below the oil level therein, an air vent pipe leading from the tank above the oil level therein and opening into the carbureter at the oil level to be maintained therein, normally closed means for the admission of oil into said tank, and means to adjust the level of the open end of said vent pipe in said carbureter, substantially as described. a

2. In combination, a carbureter, an oil supply tank above the carbureter and connected therewith, an air vent pipe leading from the top of said tank and having its open end passed centrally through the top of the carbureter, means to adjust the level of the open end of the pipe in said carbureter, and normally closed means to admit oil to said tank which is otherwise sealed to atmospheric pressure except through said vent pipe.

In testimony whereof I aflix my signature.

JESSE T. ROBINSON.

lVitness NOIu'lE WELSH. 

